Starting from the height of \(2.3\;\) R\(_{\odot }\)  onwards, we employ the SCS model (see Fig. REF a). This model starts before the end of the PFSS domain in order to reduce possible kinks in the magnetic field lines due to incompatible boundary conditions between the two models [1]}, [2]}. The purpose of the SCS is to create an approximately uniform coronal magnetic field away from the Sun, maintaining a thin structure for the heliospheric current sheet (HCS). A more uniform magnetic field is necessary in order to obtain a better agreement between the model and the observations. In particular, the Ulysses mission data suggest that the radial magnetic field component is invariant of latitude [3]}, [4]}.
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